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Apache XML Graphics Commons is a library that consists of several reusable components used by Apache Batik and Apache FOP. Many of these components can easily be used separately outside the domains of SVG and XSL-FO.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: SeekableOutputStream.java 1732018 2016-02-24 04:51:06Z gadams $ */

package org.apache.xmlgraphics.image.codec.util;

import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;

/**
 * An OutputStream which can seek to an arbitrary offset.
 *
 * @version $Id: SeekableOutputStream.java 1732018 2016-02-24 04:51:06Z gadams $
 */
public class SeekableOutputStream extends OutputStream {

    private RandomAccessFile file;

    /**
     * Constructs a SeekableOutputStream from a
     * RandomAccessFile.  Unless otherwise indicated,
     * all method invocations are fowarded to the underlying
     * RandomAccessFile.
     *
     * @param file The RandomAccessFile to which calls
     *             will be forwarded.
     * @exception IllegalArgumentException if file is
     *            null.
     */
    public SeekableOutputStream(RandomAccessFile file) {
        if (file == null) {
            throw new IllegalArgumentException("SeekableOutputStream0");
        }
        this.file = file;
    }

    public void write(int b) throws IOException {
        file.write(b);
    }

    public void write(byte[] b) throws IOException {
        file.write(b);
    }

    public void write(byte[] b, int off, int len) throws IOException {
        file.write(b, off, len);
    }

    /**
     * Invokes getFD().sync() on the underlying
     * RandomAccessFile.
     */
    public void flush() throws IOException {
        file.getFD().sync();
    }

    public void close() throws IOException {
        file.close();
    }

    public long getFilePointer() throws IOException {
        return file.getFilePointer();
    }

    public void seek(long pos) throws IOException {
        file.seek(pos);
    }
}